var debug = false;

var root = this;

var EXIF = function(obj) {
    if (obj instanceof EXIF) return obj;
    if (!(this instanceof EXIF)) return new EXIF(obj);
    this.EXIFwrapped = obj;
};

if (typeof exports !== 'undefined') {
    if (typeof module !== 'undefined' && module.exports) {
        exports = module.exports = EXIF;
    }
    exports.EXIF = EXIF;
} else {
    root.EXIF = EXIF;
}

var ExifTags = EXIF.Tags = {

    // version tags
    0x9000 : "ExifVersion",             // EXIF version
    0xA000 : "FlashpixVersion",         // Flashpix format version

    // colorspace tags
    0xA001 : "ColorSpace",              // Color space information tag

    // image configuration
    0xA002 : "PixelXDimension",         // Valid width of meaningful image
    0xA003 : "PixelYDimension",         // Valid height of meaningful image
    0x9101 : "ComponentsConfiguration", // Information about channels
    0x9102 : "CompressedBitsPerPixel",  // Compressed bits per pixel

    // user information
    0x927C : "MakerNote",               // Any desired information written by the manufacturer
    0x9286 : "UserComment",             // Comments by user

    // related file
    0xA004 : "RelatedSoundFile",        // Name of related sound file

    // date and time
    0x9003 : "DateTimeOriginal",        // Date and time when the original image was generated
    0x9004 : "DateTimeDigitized",       // Date and time when the image was stored digitally
    0x9290 : "SubsecTime",              // Fractions of seconds for DateTime
    0x9291 : "SubsecTimeOriginal",      // Fractions of seconds for DateTimeOriginal
    0x9292 : "SubsecTimeDigitized",     // Fractions of seconds for DateTimeDigitized

    // picture-taking conditions
    0x829A : "ExposureTime",            // Exposure time (in seconds)
    0x829D : "FNumber",                 // F number
    0x8822 : "ExposureProgram",         // Exposure program
    0x8824 : "SpectralSensitivity",     // Spectral sensitivity
    0x8827 : "ISOSpeedRatings",         // ISO speed rating
    0x8828 : "OECF",                    // Optoelectric conversion factor
    0x9201 : "ShutterSpeedValue",       // Shutter speed
    0x9202 : "ApertureValue",           // Lens aperture
    0x9203 : "BrightnessValue",         // Value of brightness
    0x9204 : "ExposureBias",            // Exposure bias
    0x9205 : "MaxApertureValue",        // Smallest F number of lens
    0x9206 : "SubjectDistance",         // Distance to subject in meters
    0x9207 : "MeteringMode",            // Metering mode
    0x9208 : "LightSource",             // Kind of light source
    0x9209 : "Flash",                   // Flash status
    0x9214 : "SubjectArea",             // Location and area of main subject
    0x920A : "FocalLength",             // Focal length of the lens in mm
    0xA20B : "FlashEnergy",             // Strobe energy in BCPS
    0xA20C : "SpatialFrequencyResponse",    //
    0xA20E : "FocalPlaneXResolution",   // Number of pixels in width direction per FocalPlaneResolutionUnit
    0xA20F : "FocalPlaneYResolution",   // Number of pixels in height direction per FocalPlaneResolutionUnit
    0xA210 : "FocalPlaneResolutionUnit",    // Unit for measuring FocalPlaneXResolution and FocalPlaneYResolution
    0xA214 : "SubjectLocation",         // Location of subject in image
    0xA215 : "ExposureIndex",           // Exposure index selected on camera
    0xA217 : "SensingMethod",           // Image sensor type
    0xA300 : "FileSource",              // Image source (3 == DSC)
    0xA301 : "SceneType",               // Scene type (1 == directly photographed)
    0xA302 : "CFAPattern",              // Color filter array geometric pattern
    0xA401 : "CustomRendered",          // Special processing
    0xA402 : "ExposureMode",            // Exposure mode
    0xA403 : "WhiteBalance",            // 1 = auto white balance, 2 = manual
    0xA404 : "DigitalZoomRation",       // Digital zoom ratio
    0xA405 : "FocalLengthIn35mmFilm",   // Equivalent foacl length assuming 35mm film camera (in mm)
    0xA406 : "SceneCaptureType",        // Type of scene
    0xA407 : "GainControl",             // Degree of overall image gain adjustment
    0xA408 : "Contrast",                // Direction of contrast processing applied by camera
    0xA409 : "Saturation",              // Direction of saturation processing applied by camera
    0xA40A : "Sharpness",               // Direction of sharpness processing applied by camera
    0xA40B : "DeviceSettingDescription",    //
    0xA40C : "SubjectDistanceRange",    // Distance to subject

    // other tags
    0xA005 : "InteroperabilityIFDPointer",
    0xA420 : "ImageUniqueID"            // Identifier assigned uniquely to each image
};

var TiffTags = EXIF.TiffTags = {
    0x0100 : "ImageWidth",
    0x0101 : "ImageHeight",
    0x8769 : "ExifIFDPointer",
    0x8825 : "GPSInfoIFDPointer",
    0xA005 : "InteroperabilityIFDPointer",
    0x0102 : "BitsPerSample",
    0x0103 : "Compression",
    0x0106 : "PhotometricInterpretation",
    0x0112 : "Orientation",
    0x0115 : "SamplesPerPixel",
    0x011C : "PlanarConfiguration",
    0x0212 : "YCbCrSubSampling",
    0x0213 : "YCbCrPositioning",
    0x011A : "XResolution",
    0x011B : "YResolution",
    0x0128 : "ResolutionUnit",
    0x0111 : "StripOffsets",
    0x0116 : "RowsPerStrip",
    0x0117 : "StripByteCounts",
    0x0201 : "JPEGInterchangeFormat",
    0x0202 : "JPEGInterchangeFormatLength",
    0x012D : "TransferFunction",
    0x013E : "WhitePoint",
    0x013F : "PrimaryChromaticities",
    0x0211 : "YCbCrCoefficients",
    0x0214 : "ReferenceBlackWhite",
    0x0132 : "DateTime",
    0x010E : "ImageDescription",
    0x010F : "Make",
    0x0110 : "Model",
    0x0131 : "Software",
    0x013B : "Artist",
    0x8298 : "Copyright"
};

var GPSTags = EXIF.GPSTags = {
    0x0000 : "GPSVersionID",
    0x0001 : "GPSLatitudeRef",
    0x0002 : "GPSLatitude",
    0x0003 : "GPSLongitudeRef",
    0x0004 : "GPSLongitude",
    0x0005 : "GPSAltitudeRef",
    0x0006 : "GPSAltitude",
    0x0007 : "GPSTimeStamp",
    0x0008 : "GPSSatellites",
    0x0009 : "GPSStatus",
    0x000A : "GPSMeasureMode",
    0x000B : "GPSDOP",
    0x000C : "GPSSpeedRef",
    0x000D : "GPSSpeed",
    0x000E : "GPSTrackRef",
    0x000F : "GPSTrack",
    0x0010 : "GPSImgDirectionRef",
    0x0011 : "GPSImgDirection",
    0x0012 : "GPSMapDatum",
    0x0013 : "GPSDestLatitudeRef",
    0x0014 : "GPSDestLatitude",
    0x0015 : "GPSDestLongitudeRef",
    0x0016 : "GPSDestLongitude",
    0x0017 : "GPSDestBearingRef",
    0x0018 : "GPSDestBearing",
    0x0019 : "GPSDestDistanceRef",
    0x001A : "GPSDestDistance",
    0x001B : "GPSProcessingMethod",
    0x001C : "GPSAreaInformation",
    0x001D : "GPSDateStamp",
    0x001E : "GPSDifferential"
};

var StringValues = EXIF.StringValues = {
    ExposureProgram : {
        0 : "Not defined",
        1 : "Manual",
        2 : "Normal program",
        3 : "Aperture priority",
        4 : "Shutter priority",
        5 : "Creative program",
        6 : "Action program",
        7 : "Portrait mode",
        8 : "Landscape mode"
    },
    MeteringMode : {
        0 : "Unknown",
        1 : "Average",
        2 : "CenterWeightedAverage",
        3 : "Spot",
        4 : "MultiSpot",
        5 : "Pattern",
        6 : "Partial",
        255 : "Other"
    },
    LightSource : {
        0 : "Unknown",
        1 : "Daylight",
        2 : "Fluorescent",
        3 : "Tungsten (incandescent light)",
        4 : "Flash",
        9 : "Fine weather",
        10 : "Cloudy weather",
        11 : "Shade",
        12 : "Daylight fluorescent (D 5700 - 7100K)",
        13 : "Day white fluorescent (N 4600 - 5400K)",
        14 : "Cool white fluorescent (W 3900 - 4500K)",
        15 : "White fluorescent (WW 3200 - 3700K)",
        17 : "Standard light A",
        18 : "Standard light B",
        19 : "Standard light C",
        20 : "D55",
        21 : "D65",
        22 : "D75",
        23 : "D50",
        24 : "ISO studio tungsten",
        255 : "Other"
    },
    Flash : {
        0x0000 : "Flash did not fire",
        0x0001 : "Flash fired",
        0x0005 : "Strobe return light not detected",
        0x0007 : "Strobe return light detected",
        0x0009 : "Flash fired, compulsory flash mode",
        0x000D : "Flash fired, compulsory flash mode, return light not detected",
        0x000F : "Flash fired, compulsory flash mode, return light detected",
        0x0010 : "Flash did not fire, compulsory flash mode",
        0x0018 : "Flash did not fire, auto mode",
        0x0019 : "Flash fired, auto mode",
        0x001D : "Flash fired, auto mode, return light not detected",
        0x001F : "Flash fired, auto mode, return light detected",
        0x0020 : "No flash function",
        0x0041 : "Flash fired, red-eye reduction mode",
        0x0045 : "Flash fired, red-eye reduction mode, return light not detected",
        0x0047 : "Flash fired, red-eye reduction mode, return light detected",
        0x0049 : "Flash fired, compulsory flash mode, red-eye reduction mode",
        0x004D : "Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected",
        0x004F : "Flash fired, compulsory flash mode, red-eye reduction mode, return light detected",
        0x0059 : "Flash fired, auto mode, red-eye reduction mode",
        0x005D : "Flash fired, auto mode, return light not detected, red-eye reduction mode",
        0x005F : "Flash fired, auto mode, return light detected, red-eye reduction mode"
    },
    SensingMethod : {
        1 : "Not defined",
        2 : "One-chip color area sensor",
        3 : "Two-chip color area sensor",
        4 : "Three-chip color area sensor",
        5 : "Color sequential area sensor",
        7 : "Trilinear sensor",
        8 : "Color sequential linear sensor"
    },
    SceneCaptureType : {
        0 : "Standard",
        1 : "Landscape",
        2 : "Portrait",
        3 : "Night scene"
    },
    SceneType : {
        1 : "Directly photographed"
    },
    CustomRendered : {
        0 : "Normal process",
        1 : "Custom process"
    },
    WhiteBalance : {
        0 : "Auto white balance",
        1 : "Manual white balance"
    },
    GainControl : {
        0 : "None",
        1 : "Low gain up",
        2 : "High gain up",
        3 : "Low gain down",
        4 : "High gain down"
    },
    Contrast : {
        0 : "Normal",
        1 : "Soft",
        2 : "Hard"
    },
    Saturation : {
        0 : "Normal",
        1 : "Low saturation",
        2 : "High saturation"
    },
    Sharpness : {
        0 : "Normal",
        1 : "Soft",
        2 : "Hard"
    },
    SubjectDistanceRange : {
        0 : "Unknown",
        1 : "Macro",
        2 : "Close view",
        3 : "Distant view"
    },
    FileSource : {
        3 : "DSC"
    },

    Components : {
        0 : "",
        1 : "Y",
        2 : "Cb",
        3 : "Cr",
        4 : "R",
        5 : "G",
        6 : "B"
    }
};

function addEvent(element, event, handler) {
    if (element.addEventListener) {
        element.addEventListener(event, handler, false);
    } else if (element.attachEvent) {
        element.attachEvent("on" + event, handler);
    }
}

function imageHasData(img) {
    return !!(img.exifdata);
}


function base64ToArrayBuffer(base64, contentType) {
    contentType = contentType || base64.match(/^data\:([^\;]+)\;base64,/mi)[1] || ''; // e.g. 'data:image/jpeg;base64,...' => 'image/jpeg'
    base64 = base64.replace(/^data\:([^\;]+)\;base64,/gmi, '');
    var binary = atob(base64);
    var len = binary.length;
    var buffer = new ArrayBuffer(len);
    var view = new Uint8Array(buffer);
    for (var i = 0; i < len; i++) {
        view[i] = binary.charCodeAt(i);
    }
    return buffer;
}

function objectURLToBlob(url, callback) {
    var http = new XMLHttpRequest();
    http.open("GET", url, true);
    http.responseType = "blob";
    http.onload = function(e) {
        if (this.status == 200 || this.status === 0) {
            callback(this.response);
        }
    };
    http.send();
}

function getImageData(img, callback) {
    function handleBinaryFile(binFile) {
        var data = findEXIFinJPEG(binFile);
        var iptcdata = findIPTCinJPEG(binFile);
        img.exifdata = data || {};
        img.iptcdata = iptcdata || {};
        if (callback) {
            callback.call(img);
        }
    }

    if (img.src) {
        if (/^data\:/i.test(img.src)) { // Data URI
            var arrayBuffer = base64ToArrayBuffer(img.src);
            handleBinaryFile(arrayBuffer);

        } else if (/^blob\:/i.test(img.src)) { // Object URL
            var fileReader = new FileReader();
            fileReader.onload = function(e) {
                handleBinaryFile(e.target.result);
            };
            objectURLToBlob(img.src, function (blob) {
                fileReader.readAsArrayBuffer(blob);
            });
        } else {
            var http = new XMLHttpRequest();
            http.onload = function() {
                if (this.status == 200 || this.status === 0) {
                    handleBinaryFile(http.response);
                } else {
                    throw "Could not load image";
                }
                http = null;
            };
            http.open("GET", img.src, true);
            http.responseType = "arraybuffer";
            http.send(null);
        }
    } else if (window.FileReader && (img instanceof window.Blob || img instanceof window.File)) {
        var fileReader = new FileReader();
        fileReader.onload = function(e) {
            if (debug) console.log("Got file of length " + e.target.result.byteLength);
            handleBinaryFile(e.target.result);
        };

        fileReader.readAsArrayBuffer(img);
    }
}

function findEXIFinJPEG(file) {
    var dataView = new DataView(file);

    if (debug) console.log("Got file of length " + file.byteLength);
    if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
        if (debug) console.log("Not a valid JPEG");
        return false; // not a valid jpeg
    }

    var offset = 2,
        length = file.byteLength,
        marker;

    while (offset < length) {
        if (dataView.getUint8(offset) != 0xFF) {
            if (debug) console.log("Not a valid marker at offset " + offset + ", found: " + dataView.getUint8(offset));
            return false; // not a valid marker, something is wrong
        }

        marker = dataView.getUint8(offset + 1);
        if (debug) console.log(marker);

        // we could implement handling for other markers here,
        // but we're only looking for 0xFFE1 for EXIF data

        if (marker == 225) {
            if (debug) console.log("Found 0xFFE1 marker");

            return readEXIFData(dataView, offset + 4, dataView.getUint16(offset + 2) - 2);

            // offset += 2 + file.getShortAt(offset+2, true);

        } else {
            offset += 2 + dataView.getUint16(offset+2);
        }

    }

}

function findIPTCinJPEG(file) {
    var dataView = new DataView(file);

    if (debug) console.log("Got file of length " + file.byteLength);
    if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
        if (debug) console.log("Not a valid JPEG");
        return false; // not a valid jpeg
    }

    var offset = 2,
        length = file.byteLength;


    var isFieldSegmentStart = function(dataView, offset){
        return (
            dataView.getUint8(offset) === 0x38 &&
            dataView.getUint8(offset+1) === 0x42 &&
            dataView.getUint8(offset+2) === 0x49 &&
            dataView.getUint8(offset+3) === 0x4D &&
            dataView.getUint8(offset+4) === 0x04 &&
            dataView.getUint8(offset+5) === 0x04
        );
    };

    while (offset < length) {

        if ( isFieldSegmentStart(dataView, offset )){

            // Get the length of the name header (which is padded to an even number of bytes)
            var nameHeaderLength = dataView.getUint8(offset+7);
            if(nameHeaderLength % 2 !== 0) nameHeaderLength += 1;
            // Check for pre photoshop 6 format
            if(nameHeaderLength === 0) {
                // Always 4
                nameHeaderLength = 4;
            }

            var startOffset = offset + 8 + nameHeaderLength;
            var sectionLength = dataView.getUint16(offset + 6 + nameHeaderLength);

            return readIPTCData(file, startOffset, sectionLength);

            break;

        }


        // Not the marker, continue searching
        offset++;

    }

}
var IptcFieldMap = {
    0x78 : 'caption',
    0x6E : 'credit',
    0x19 : 'keywords',
    0x37 : 'dateCreated',
    0x50 : 'byline',
    0x55 : 'bylineTitle',
    0x7A : 'captionWriter',
    0x69 : 'headline',
    0x74 : 'copyright',
    0x0F : 'category'
};
function readIPTCData(file, startOffset, sectionLength){
    var dataView = new DataView(file);
    var data = {};
    var fieldValue, fieldName, dataSize, segmentType, segmentSize;
    var segmentStartPos = startOffset;
    while(segmentStartPos < startOffset+sectionLength) {
        if(dataView.getUint8(segmentStartPos) === 0x1C && dataView.getUint8(segmentStartPos+1) === 0x02){
            segmentType = dataView.getUint8(segmentStartPos+2);
            if(segmentType in IptcFieldMap) {
                dataSize = dataView.getInt16(segmentStartPos+3);
                segmentSize = dataSize + 5;
                fieldName = IptcFieldMap[segmentType];
                fieldValue = getStringFromDB(dataView, segmentStartPos+5, dataSize);
                // Check if we already stored a value with this name
                if(data.hasOwnProperty(fieldName)) {
                    // Value already stored with this name, create multivalue field
                    if(data[fieldName] instanceof Array) {
                        data[fieldName].push(fieldValue);
                    }
                    else {
                        data[fieldName] = [data[fieldName], fieldValue];
                    }
                }
                else {
                    data[fieldName] = fieldValue;
                }
            }

        }
        segmentStartPos++;
    }
    return data;
}



function readTags(file, tiffStart, dirStart, strings, bigEnd) {
    var entries = file.getUint16(dirStart, !bigEnd),
        tags = {},
        entryOffset, tag,
        i;

    for (var i=0;i<entries;i++) {
        entryOffset = dirStart + i*12 + 2;
        tag = strings[file.getUint16(entryOffset, !bigEnd)];
        if (!tag && debug) console.log("Unknown tag: " + file.getUint16(entryOffset, !bigEnd));
        tags[tag] = readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd);
    }
    return tags;
}


function readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd) {
    var type = file.getUint16(entryOffset+2, !bigEnd),
        numValues = file.getUint32(entryOffset+4, !bigEnd),
        valueOffset = file.getUint32(entryOffset+8, !bigEnd) + tiffStart,
        offset,
        vals, val, n,
        numerator, denominator;

    switch (type) {
        case 1: // byte, 8-bit unsigned int
        case 7: // undefined, 8-bit byte, value depending on field
            if (numValues == 1) {
                return file.getUint8(entryOffset + 8, !bigEnd);
            } else {
                offset = numValues > 4 ? valueOffset : (entryOffset + 8);
                vals = [];
                for (var n=0;n<numValues;n++) {
                    vals[n] = file.getUint8(offset + n);
                }
                return vals;
            }

        case 2: // ascii, 8-bit byte
            offset = numValues > 4 ? valueOffset : (entryOffset + 8);
            return getStringFromDB(file, offset, numValues-1);

        case 3: // short, 16 bit int
            if (numValues == 1) {
                return file.getUint16(entryOffset + 8, !bigEnd);
            } else {
                offset = numValues > 2 ? valueOffset : (entryOffset + 8);
                vals = [];
                for (var n=0;n<numValues;n++) {
                    vals[n] = file.getUint16(offset + 2*n, !bigEnd);
                }
                return vals;
            }

        case 4: // long, 32 bit int
            if (numValues == 1) {
                return file.getUint32(entryOffset + 8, !bigEnd);
            } else {
                vals = [];
                for (var n=0;n<numValues;n++) {
                    vals[n] = file.getUint32(valueOffset + 4*n, !bigEnd);
                }
                return vals;
            }

        case 5:    // rational = two long values, first is numerator, second is denominator
            if (numValues == 1) {
                numerator = file.getUint32(valueOffset, !bigEnd);
                denominator = file.getUint32(valueOffset+4, !bigEnd);
                val = new Number(numerator / denominator);
                val.numerator = numerator;
                val.denominator = denominator;
                return val;
            } else {
                vals = [];
                for (var n=0;n<numValues;n++) {
                    numerator = file.getUint32(valueOffset + 8*n, !bigEnd);
                    denominator = file.getUint32(valueOffset+4 + 8*n, !bigEnd);
                    vals[n] = new Number(numerator / denominator);
                    vals[n].numerator = numerator;
                    vals[n].denominator = denominator;
                }
                return vals;
            }

        case 9: // slong, 32 bit signed int
            if (numValues == 1) {
                return file.getInt32(entryOffset + 8, !bigEnd);
            } else {
                vals = [];
                for (var n=0;n<numValues;n++) {
                    vals[n] = file.getInt32(valueOffset + 4*n, !bigEnd);
                }
                return vals;
            }

        case 10: // signed rational, two slongs, first is numerator, second is denominator
            if (numValues == 1) {
                return file.getInt32(valueOffset, !bigEnd) / file.getInt32(valueOffset+4, !bigEnd);
            } else {
                vals = [];
                for (var n=0;n<numValues;n++) {
                    vals[n] = file.getInt32(valueOffset + 8*n, !bigEnd) / file.getInt32(valueOffset+4 + 8*n, !bigEnd);
                }
                return vals;
            }
    }
}

function getStringFromDB(buffer, start, length) {
    var outstr = "";
    for (var n = start; n < start+length; n++) {
        outstr += String.fromCharCode(buffer.getUint8(n));
    }
    return outstr;
}

function readEXIFData(file, start) {
    if (getStringFromDB(file, start, 4) != "Exif") {
        if (debug) console.log("Not valid EXIF data! " + getStringFromDB(file, start, 4));
        return false;
    }

    var bigEnd,
        tags, tag,
        exifData, gpsData,
        tiffOffset = start + 6;

    // test for TIFF validity and endianness
    if (file.getUint16(tiffOffset) == 0x4949) {
        bigEnd = false;
    } else if (file.getUint16(tiffOffset) == 0x4D4D) {
        bigEnd = true;
    } else {
        if (debug) console.log("Not valid TIFF data! (no 0x4949 or 0x4D4D)");
        return false;
    }

    if (file.getUint16(tiffOffset+2, !bigEnd) != 0x002A) {
        if (debug) console.log("Not valid TIFF data! (no 0x002A)");
        return false;
    }

    var firstIFDOffset = file.getUint32(tiffOffset+4, !bigEnd);

    if (firstIFDOffset < 0x00000008) {
        if (debug) console.log("Not valid TIFF data! (First offset less than 8)", file.getUint32(tiffOffset+4, !bigEnd));
        return false;
    }

    tags = readTags(file, tiffOffset, tiffOffset + firstIFDOffset, TiffTags, bigEnd);

    if (tags.ExifIFDPointer) {
        exifData = readTags(file, tiffOffset, tiffOffset + tags.ExifIFDPointer, ExifTags, bigEnd);
        for (var tag in exifData) {
            switch (tag) {
                case "LightSource" :
                case "Flash" :
                case "MeteringMode" :
                case "ExposureProgram" :
                case "SensingMethod" :
                case "SceneCaptureType" :
                case "SceneType" :
                case "CustomRendered" :
                case "WhiteBalance" :
                case "GainControl" :
                case "Contrast" :
                case "Saturation" :
                case "Sharpness" :
                case "SubjectDistanceRange" :
                case "FileSource" :
                    exifData[tag] = StringValues[tag][exifData[tag]];
                    break;

                case "ExifVersion" :
                case "FlashpixVersion" :
                    exifData[tag] = String.fromCharCode(exifData[tag][0], exifData[tag][1], exifData[tag][2], exifData[tag][3]);
                    break;

                case "ComponentsConfiguration" :
                    exifData[tag] =
                        StringValues.Components[exifData[tag][0]] +
                        StringValues.Components[exifData[tag][1]] +
                        StringValues.Components[exifData[tag][2]] +
                        StringValues.Components[exifData[tag][3]];
                    break;
            }
            tags[tag] = exifData[tag];
        }
    }

    if (tags.GPSInfoIFDPointer) {
        gpsData = readTags(file, tiffOffset, tiffOffset + tags.GPSInfoIFDPointer, GPSTags, bigEnd);
        for (var tag in gpsData) {
            switch (tag) {
                case "GPSVersionID" :
                    gpsData[tag] = gpsData[tag][0] +
                        "." + gpsData[tag][1] +
                        "." + gpsData[tag][2] +
                        "." + gpsData[tag][3];
                    break;
            }
            tags[tag] = gpsData[tag];
        }
    }

    return tags;
}

EXIF.getData = function(img, callback) {
    if ((img instanceof Image || img instanceof HTMLImageElement) && !img.complete) return false;

    if (!imageHasData(img)) {
        getImageData(img, callback);
    } else {
        if (callback) {
            callback.call(img);
        }
    }
    return true;
}

EXIF.getTag = function(img, tag) {
    if (!imageHasData(img)) return;
    return img.exifdata[tag];
}

EXIF.getAllTags = function(img) {
    if (!imageHasData(img)) return {};
    var a,
        data = img.exifdata,
        tags = {};
    for (var a in data) {
        if (data.hasOwnProperty(a)) {
            tags[a] = data[a];
        }
    }
    return tags;
}

EXIF.pretty = function(img) {
    if (!imageHasData(img)) return "";
    var a,
        data = img.exifdata,
        strPretty = "";
    for (var a in data) {
        if (data.hasOwnProperty(a)) {
            if (typeof data[a] == "object") {
                if (data[a] instanceof Number) {
                    strPretty += a + " : " + data[a] + " [" + data[a].numerator + "/" + data[a].denominator + "]\r\n";
                } else {
                    strPretty += a + " : [" + data[a].length + " values]\r\n";
                }
            } else {
                strPretty += a + " : " + data[a] + "\r\n";
            }
        }
    }
    return strPretty;
}

EXIF.readFromBinaryFile = function(file) {
    return findEXIFinJPEG(file);
}

if (typeof define === 'function' && define.amd) {
    define('exif-js', [], function() {
        return EXIF;
    });
}

export default EXIF
